Vehicle and road modifications are generally more effective than behavioral change efforts with the exception of certain laws such as required use of seat belts, motorcycle helmets and graduated licensing of teenagers.
Human factors in vehicle collisions include anything related to drivers and other road users that may contribute to a collision.
Traffic collisions can be classified by general type.
Types of collision include head-on, road departure, rear-end, side collisions, and rollovers.
A 1985 report based on British and American crash data found driver error, intoxication and other human factors contribute wholly or partly to about 93% of crashes.
Many different terms are commonly used to describe vehicle collisions.
The World Health Organization use the term road traffic injury, Other common terms include auto accident, car accident, car crash, car smash, car wreck, motor vehicle collision (MVC), personal injury collision (PIC), road accident, road traffic accident (RTA), road traffic collision (RTC), road traffic incident (RTI), road traffic accident and road traffic collision, as well as more unofficial terms including smash-up, pile-up, and fender bender.
Older drivers with slower reactions might be expected to be involved in more collisions, but this has not been the case as they tend to drive less and, apparently, more cautiously.
Conversely, a location that does not look dangerous may have a high crash frequency.